Method and apparatus for making color-correcting and color-separation negatives for plate-printing trades



E. A. TIASCHKE. METHOD AND APPARATUS FOR MAKING COLOR CORRECTING AND COLOR SEPARATIUN NEGATIVES FOR PLATE PRINTING TRADES.

APPLICATION FILED SEPT.3| 1918- Patented Mar. 29, 1921.

in Z Z 4 E. A. RASCHKE.

METHOD AND APPARATUS FOR MAKING COLOR CORRECTING AND COLOR SEPARATION NEGATIVES FOR PLATE PRINTING TRADES.

APPLICATION FILED SEPT-$1918- Patented Mar. 29, 1921.

3 SHEETS-SHEEI 2.

m m- ..IIsifiiirliillililllllilr iFli-Ili E. A. RASCHKE. METHOD AND APPARATUS FOR MAKING COLOR CORRECTING AND COLOR SEPARATION NEGATIVES FDII PLATE PRINTING TRADES.

I APPLICATION FILED SEPT-311918.

3 SHEETS-SHEEI 3.

fatented Mar. 29, 1921.

III! IIIIIIIIIIII II. vliuitllwiailniivtiii triruuivriitrvrvvvvr wL UNITED,

res-frArsnr OFFICE.

mm. A. nnsonxn, or cnr'cne 'rtnmors.

METHOD AND APPARA TUS FOR MAKING GOLOR-GOBREC TI NG AND GO LOR-SEPARA- TION NEGATIVES FOR. PLATE- PRIN'IING TRADES.

Specification of letterslatent. Patnt d M 29 1921 Application-filed September 8, 1918., Serial 110,252,285.

To (all whomit may concern: l

Be it known that I, EMIL A.,RAs0HKE, a

citizen of the United States, andamesident of the city of Chicago, county of Cook, and

State of Illinois, have invented certain new and useful Im rovements in Methods and Apparatus for aking Color-Qorrectin and olor-Separation Negatives for-Platerinting Trades, of which the following-is a specification.

My invention relates to improvements in method and apparatus for makingcolor correcting and color separation negatives for plate printing trades, andhas for its object the provision of an improved method and apparatus by means of which such negatives,

and printing plates therefrom, may be quickly and economically made without restriction as to the size of the subject or light conditions, using either sunlight, daylight,

, or artificial light; by means of which rugs,

liti

til

till

oil paintings, and the like, may be photographed and reproduced as readily as pastels, with great gradation in detail formation; and by means of which such work may be done by the artists, as they are known in the lithographic arts,andj by the color etchers, as they are known in the en graving arts, with great ease and expedition,

@ther objects will appear hereinafter) The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understoodby;

reference to the accompanying drawin s forming a part of this specification, and in which, V I

Figure 1, is a side view, shown partially in section, of the rear endof an ordinary camera for the purpose equipped with apparatus embodying the invention and arranged and adapted for carrying on the improved process,

Fig. 2, a front face view of a removable frame employed in the apparatus and process, and adapted to be readily inserted in or removed from the camera, Pg. 3, a section taken on line Fig. 2, i

Fig. 4, a section taken on line 4'4= of Fig. 2,

Fig. 5 an enlarged section taken on line 5 -5 of Fig. 2,

Fig. 6, a partial horizontal section through- -removed from the camera, and

the rear of the camera, showing the appa ratus in'position,

Fig. 7, .a rear elevation of the apparatus Fig. 8,'an enlarged detail section illustrating one of a plurality of adjusting screws em loy'edi'n the apparatus.

he preferredv form of apparatus, as illus- .trated in the drawings, comprises a su port:

wardly swinging frame 12 hinged at 12' to frame 9 and provided with channeled guides 13, open at the top for the ready insertion or removal of a plain clear glass plate 14,

'A-cord 15 is attached to frame 12 and passes over a guide pulley 16 on the forward end of a post 17 on frame 9 and thence through asuitable aperture or opening in the side of the camera and by means of which the frame 12 may be swung forwardly, as indicated in' full lines in Fig. 6, said cord being referably provlded on its end with a ring by means -of which the same'mav be readily secured go anail or the like to hold the frame 12 in its forward position when desired... A leaf spring 18, secured to frame 19 and'resting loosely against frame-12'serves to swing frame 12 to its operative position over the central opening-in frame 9 when desired,

upon. release of the cord 15, as will be readly understood. By this arrangement it will beobserved that unexposed sensitized plates may be inserted in the plate holder 11 and exposed to light from the subject being treated, passing through said suitable color filters, to produce the usual negativesfor the, purpose, as will be readily understood by those skilled in this art.

Another forwardly swinging fra 'ni e-li) is l pivoted or hinged at 19'to the other side of supporting frame 9, and. is'equipped with aleaf spring 20 normally holding the same 1n,

operative position. A cord 21 is secured to frame 19 and passed" over guide pulley-'22 and through a suitable aperture in' the side of the camera 10 andby means of which frame 19' may manipulated in the same manner as frame 3,? as explained above. "An adjusting frame 23 is mounted within the r ot frame 19 for free adjustment therein, and resting at its bottom on a spring-held supporting point 24, as shown. Frame 23 carries at one side a lug 25 threaded upon an adjusting shaft 26 mounted upon frame 19 and connected by beveled gears 27 with an operating shaft 28, which is carried by a lug 28 on frame 19 operating through a suitable slot in frame 9, as shown. Shaft 28 is in turn connected by means of a detachable slot and lug connection 29 with a longitudinally movable hand shaft 30, having a knurled hand wheel 31 thereon, and wherebyshaft 26 may be readily manipulated to adjust the frame 23 vertically within the frame 19 and-the parts freed for forward swinging of frame 19. An adjusting screw 32 is mounted in a swivel post 33 on frame 19 and is threaded in a swiveled ear or lug 34 on frame 23, and whereby the frame 23 may be angularly adjusted within the frame 19, rocking or swinging upon the point 24, as will be readily understood.

Frame 23 is provided in each corner with an adjusting screw 35 carrying a collar 37 imprisoned between a laterally adjustable bracket 36 and the corresponding corner of the frame, and whereby other frames may be secured for forward and back adjustments. In the form of apparatus illustrated, a filler frame 38 is shown. as secured within the frame 23 by means of the screws 35, said filler frame being similarly equipped with these adjusting screws at each corner thereof. Likewise, another filler frame 39 is shown as secured in place within the frame 38 and similarly equipped at its corners with adjusting screws 35. as shown. A negative holding frame 40 is secured within the filler frame 39 by means of its adjusting screws 35, said negative frame bein grooved on its sides, just as is frame 12, and adapted to receive various negatives. when desired. B omitting or using one or more of the filler and negative frames, negatives of various sizes may be provided for. An arrangement providing for larger negatives has been illustrated in Fig. 7, wherein a negative frame 40' is shown as mounted in frame 23 to receive larger negatives il.

In carrying on the improved process, the frame 12 is first adjusted to position on frame 9 directly in front of the plate holder 11 and parallel thereto, and preliminary negatives obtained by exposing sensitized plates to the subject through different color filters and the clear glass 14 in the usual manner, to obtain negatives for the production of the different plates for producing the different colors of the subject. Thus. negatives will be made by making exposures through violet, green, red, or any suitable color filter in frame 12, depending upon the colors in the subject which it is desired to reproduce and as will be readily understood by those skilled in the art. These various preliminary negatives are developed, fixed and washed in the usual manner. Then, one of these negatives suitable to the required or desired separation, say for instance, for the yellow printing plate, or the red printing plate. or the blue printing plate, or the black printing plate is selected, the operator depending upon his skill and experience in this art in making a selection of the negative which will give the best results for the color plate desired. Each of the negatives thus selected for the different plates for producing the different colors is in turn placed in the frame 19. which. of course, is previously idjusted to arallel position before the plate holder 11. tie frame 12 being swung forwardly for the purpose, as indicated in Fig. 3. After each negative has been thus placed in operative position in the camera, its hold- :ng frame is nicely adjusted by means of the various adjustments provided until said negative is brought into proper register with the image of the subject in the camera. as ill be readily understood by those skilled in this art. To accomplish nice registration. it will be observed that vertical, angular. and forward and back adjustments are orovided. so that the negatives may be thus delicately adjusted to proper registration with the image ofthe subject.

After each of the preliminary negatives has thus been placed in registration with the image in the camera, an unexposed sensitive plate is arranged in the plate holder 11 and exposed through a suitable color filter, with the negative as a screen, and permitting only those portions of light which indicate clear glass to act on the plate in the plate holder for a given time, such time being determined by the skill and judgment of the operator, depending upon the light conditions, the subject in hand, the character and qualities of the lens of the camera, as is usual in this art. After a suitable exposure, depending upon the judgment of the operator, the lens of the camera is cap ed or closed, and the negative withdrawn f i'om its registering position by means of the cord 21 extending to the outside of the camera, such withdrawal being thus permitted without disturbing the relations of the image of the subject to the plate in the plate holder. The exposure is then completed through the proper color filter in the usual manner, and for a time depending upon the judgment of the operator, as above outlined. The late thus produced is removed. developed, xed and washed in the usual manner, and is then ready for use in the usual manner for the production of a printing plate to print the corresponding color in the subject under treatment. Likewise. other negatives are those produced for the other colors in the subject, and from them corresponding plates are produced in the usual manner for the corresponding colore of the subject, all as will be readily duction of the proper negatives. or plates for the purpose, it-being well known and understood in this art how to produce the actual printing plates from these negatives.

til

In this manner and by use of the apparatus disclosed, plates for reproducing the various colors in a subject matter w1ll be readily and economically provided, irres ecj tive of the size of the subject or the light T p conditions, and with great. gradation in detail formation. I Y

While I' have illustrated and described the preferred method of procedure and apparatus for car ing on the same, these are capable of varlation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the. precise details of construction set forth, but desire to avail myself of suchvariations and modifications as come within the sage of the appended claims.-

aving described my invention, what I claim as new and desire to secure by Letters Patent is l. The, method of making negatives from which printing plates .may be produced which consists in first making a negative of'the subject ;'.then exposing a plate tolight from said subject passing through said negative; then exposing said plate to direct light from said subject; and then developing said plate, substantially as described.

2., The method of making negatives from which printing plates may be produced Which consists lIlfiI'St making a negative of the subject by means of color filtered light therefrom; then exposing a plate to color filtered light from said subject passing through saidnegative; then exposing said plate to direct light from said subject; andv then developing said plate, substantially as described.

3. The method of making negatives from which printing plates may be produced which consists in first making a series of negatives of the subject by means of color filtered li ht therefrom; then exposing plate to light rom said subject passing through said negatives; then exposing said plates to direct light from said subject; and then developing said plates, substantially as described.

subject; and then developing said plates, substantially as described.

'5. The method of making negatives from which printing plates may be produced which consists 1n first making a negative of the subject by means of color filtered light therefrom; then exposing a plate through a suitable color filter to light from said subject passing through said negative; then exposing said plate to color filtered light from "said subject with said negative removed; and then developing said plate, substantially as described.

6. The method of making negatives from which printing plates may be'produced which consists infirst making a plurality of negatives of the subject by exposing plates to color filtered light from said subject; then exposin plates to color filtered light from said su ject passing through said negatives for different lengths of time; then exposing said plates to color filtered light from said subject with the corresponding negative removed; and then developing said plates, substantially as described. 7. Apparatus for makin negatives from which printing plates may fie roduced comprising a camera having a p ate holder; a negative holder arranged in front of said plate holder; and means for temporarily removin said negative holder from in front of sai plate holder, substantially as described.

8. Apparatus for, making negatives fro 1nv which printing plates may be produced comprising a camera having a plate holder; a

clear glass member arranged tobe positioned in front of said plate holder; a negative holding member arranged to be positioned in front of said plate holder; and

means for temporarily removing and replac- 7 ing said clear glass member and saidnegative holder, substantially as described.

10. Apparatus for ma 'ng negatives from which printing plates may be produced comprising a camera having a plate holder; a clear glass member arranged to be positioned in front of said plate holder; an adjustable negative holding member arranged to be posltioned in front of said plate holder and means for temporarily removin and rplacing said clear glass member an said negative holder substantially as described.

11. Apparatus for making negatives from which printing plates maybe produced comprising a camera having a plate holder; at

negative holding member arranged in front of said plate holder; means adapting said negative holder to the reception of negatives of various sizes; and means for temporarily removing said negative holder; substantially as described.

12. Apparatus for making negatives from Which printing plates may be produced comprising a camera having a plate holder; a

color filter member arranged to be positioned in front of said plate holder; a negative holding member arranged to be positioned in front of said plate holder; means adapting said negative holder to the reception of negatives of various sizes; and means temporarily removing and replacing said filter member and said negative holder, substantially as described.

14. A which printing plates may be produced comprising a camera having a plate .holder; a color filter member arranged to be posi tioned in front of said plate holder; an adjustable negative holding member arranged to be positioned in front of said plate holder; means adapting said negative holder to the reception of negatives of various sizes; and

pparatus for making negatives from means temporarily removing and replacing said filter member and said negative holder, substantially as described.

15. Apparatus for making negatives from which printing plates may be produced coinarising a camera having a plate holder; :1 frame insertible in said camera in front of said plate holder; two forwardly swinging frames on said insertible frame said swin ing frames being provided with glass hold- :ng means; and means, on the outside of said camera. for manipulating said swing- Lng frames. substantially as described.

L6. Apparatus for making negatives from vnich printing plates may be produced oomprising a camera having a plate holder; a frame insertible in said camera in front of said plate holder: a swinging frame on said insertible frame provided with means for holding a clear glass plate; a second swing frame on said insertible frame; a negative holding frame mounted on said second swinging frame: means for adjusting said negative frame vertically, forward, and back and angularly in said second swinging frame; and means, on the outside of said :amera, for manipulating said swinging frames, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EMIL A. RASCHKE. Witnesses:

JOSHUA R. H. Porrrs. 3. G. RICHARDS. 

